|
Bobby,
I did some maths on my single configuration and
that compares well to Powersports figures and we both agree that 44mm is the
optimum PP diameter.
My figures are 240hp (approx) at 7500 rpm - a bit
higher with the renesis 10:1 rotors. So I'm
looking for between 115hp and 125 hp with a take-off rpm of 7200
rpm. IMHO the PP is well worth consideration
if power levels are borderline, as in my case with the single with weight
considerations.
One of the chaps who was involved in Powerspart was
on the other list and gave some great insight into their development work and
their very small and light development of a 2 rotor which came out to a similar
weight to an Al housing development - beautiful little engine. They used chrome
molly (oven brazed) centre and end housings with a 12A crank - lovely work. I
have a photo if anyone is interested. One thing about PL's site, the people
drawn to it and a wealth of input, but not necessarily PL's.
Like Ed, I look forward to the 16X - perhaps a 16X
single, if the power is right.
George ( down under)
The
chart is based on an engine rpm of 6800.
Bobby
Bobby,
That's realistic and perhaps conservative, what
RPM was that?
George (down under)
Not sure the first email made it through. I would
like to compare the P-Port dyno with supercharger performance at the same
rpm between 5200 and 7500. Attached are my HP estimates and they seem to be
close to Vans actual performance expectations for a 235hp engine. But I am a
little concerned about running the Eaton M62 4th gen this hard. I have not
been able to find any data concerning sustained high rpm operations. If the
dyno numbers look good I may build a P-Port since it would not require any
other changes other than intake. I do plan to eventually put a 3 rotor or
16B p -port in the plane but I'm not ready for another year of
building. Time to do some flying and spend time with the family.
Thanks Bobby
Paul,
Do you
have a dyno chart from your P-Port Renesis test? If so I would
like to get a copy. Just about got the RV10 back together after several
major changes. Moving the aluminum Berry Mount spacers to the top of the
S-Beam almost corrected my thrust line problem. I was also able to remove
most of the spacers from the rear beam. Still a little angle on the
right side that may require some machine work. It will
be interesting to see if it fly's differently.
Thanks,
--
Homepage: http://www.flyrotary.com/
Archive and
UnSub:
http://mail.lancaironline.net:81/lists/flyrotary/List.html
|